“His voice and laugh,” Grande replied to a who tweeted a video of the musician to her on Tuesday. “He is supposed to be here.”

“She completely broke down after she found out about Mac,” an insider told PEOPLE in September after Miller’s death. “She can’t believe he isn’t here anymore. He was such a special person to her. She is very, very sad. … This is a nightmare for her.”

Grande had been an advocate for Miller’s sobriety. “They were very much in love, and I have to say, she was incredible when he was first sobering up,” Miller’s friend Shane Powers said on his podcastThe Shane Show in September.

“She was a f—ing G to him. There could not have been anybody more supportive of him being sober than Ariana,” Powers continued. “There was no one in his life more ready to go to the wall for him when it came to him being sober. She was an unbelievably stabilizing force in his life and she was deeply helpful and effective in keeping Mac sober and helping him get sober.”

Miller’s death may have factored into Grande’s split from Davidson. “It’s true that Ariana has been struggling a bit with life in general” after Miller’s death, a source told PEOPLE after Grande and Davidson’s breakup.

“[Miller’s death] was devastating and shocking to her,” the source added. “It’s had a huge, negative impact on her life. It made her rethink many things in her life.”

“She realized that planning a wedding right now felt very rushed,” the source said. “It’s not what she wants to do right now. She doesn’t want to make any rushed decisions and has decided to take a step back instead.”

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